Portable saw



J. M. CROWE PORTABLE sAw Filed April 19. 1923 4 Sheets-Sheet .1

June 2, 1925.

J. M. CRQWE PORTABLE SAW Filed April 19 1923 4 Sheets-Sheet 2 June 2,1925.

J. M. CROWE PORTABLE SAW Filea April 19, 1923 4 Sheets-Sheet J. M. CROWEPORTABLE SAW Filed April 19. 1923 4 Sheets-Sheet 4.

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Patented June 2, 1925.

. UNITED STATES.

1,540,388 PATENT OFFICE.

JOHN M. CROWE, OF COVINGTON, KENTUCKY, .ASSIGNCR TO THE CROWE MANUFAC-TURING COMPANY, OF COVINGTON, KENTUCKY. A CORPORATION OF KENTUCKY.

PORTABLE SAW.

Application filed April 19,

To all whom it may concern; I

Be it known that JOHN M. CROWELCIUZBH of the United States, residing atCovmgtou,

in the county of Kenton and State of Kcn means for determining the angleof the path of the cutting operation with respect to the end or side ofthe work; to provide means whereby thetool can be set so as to cutgrooves-of various depths andwidths; to provide an improved means forpreventing heating of the driving members for the saw; to provide meansfor arranging and sus-. pending. a portable motor-operated sawso thatthe same can serve as a saw mill which can be readily carried by theworkman from one piece of work to another; and finally to improvegenerally the construction and arrangement of a portable rotary saw ofthe type herein disclosed.

Fig. 1 shows my improved device in side elevation; Fig. 2 is a plan viewof the same; Fig. 3 is a sectional view taken on line 33 of Fig. 2; Fig.4 is a transverse sectional view of the drive connection for the saw;Fig. 5 is a rear end elevation of my improved device and illustrates themanner in which the tool can be set at various angles with respect tothe surface of the work Fig. 6 is a detail view showing the springcontrol for the shield; Fig. 7 is a detail plan view showing the bracketsupport for the motor casing; Fig. 8 is a side elevation of the saw whensuspended from a table so as to serve as a portable saw-mill; Fig. 9 isa sectional view taken on line 99 of Fig.8; and Fig. 10 is a partialside elevation of the table for the saw with the motor and saw removed.

The guideway upon which the supporting bracket of the motor saw isslidably mounted comprises the base portion 1 and the slide rod 2extending throughout the length thereof and provided with the stops 3.The

swinging arm 4 is mounted for swinging movement upon the rod 2 andsupports at its other end the motor in a manner to be later described.The supporting bracket -1 192a. Seria1 No.633,178.

is provided also with the depending tapered portion 5 which is adaptedto engage for sliding movement in a correspondingly formed slidewayprovided in the upwardly extending portion 6 which constitutes part ofthe slideway 1. The well portion 7 13 provided in the bottom of theslideway so as to catch any dirt.

The motor casing 8 is provided with the depending foot portion 9, whichis freely rotatable upon the stub shaft 10 secured in the-angular collarportion 11, the collar 12 being -provided on the other *end of the stubshaft 10. Another stub shaft- 13 ex-v tends through and is fixed inthe-collar 11 and is rotatably mounted in the end portion of the bracketarm 4 for adjustment thereirn to seat for co-operation with the mark 15.

provided on the bracket 4. The nut 16and" the washer 17 are provided tomaintain the parts in set position. With this arrangement, it ispossible upon loosening the nut 16. to turn the shaft 13 in the bracket4 to the desired position in which the same may be set by thentightening the nut 16. This ad ustment is useful for setting the sawat'various angles with respect to the surface ofthe work. The handles 18are provided as extensions on the two sides of the motor easing, intoo'neof which are led the wire connections 19 for the motor with thecontrol switch 20 adapted for convenient operation by the workmansthumb.

The drive shaft 21 of the motor extends out through the housing, portion22 which is an extension of the main motor casing, and on the free endof shaft 21 there is mounted the bevel pinion 23 which meshes with thebevel gear 24 carried by the stub shaft 25. The housing extension 22 isformed so as to provide a housing portion 26 enclosing the bevel pinionand. gear 23 and 24 for the purpose of holding graphite or the like toprevent heating of the gear connection and also to serve as a lubricant.The housing 26 is closed by means of the cover 27 which is secured inposition by means of the screws 28, the housing being otherwise closed.The hub of the bevel gear 24: extends through the cover 27 and isadapted to receive the saw disc 29 which is secured in such position bymeans of the nut 30. The bevel gear the arcuate slot 34 formed in theside wall 35 of the shield which protects the saw. The shield ispivotally mounted at the points 38 on the two sides of the housingextension 22 and is normallv held in protecting position by means of thecoil spring 36, one end of which is secured to the housing portion 26while its other end is anchored to a cross member 37 which forms part ofthe shield.

It will be understood that upon applying the saw to the work which isindicated in the form of a board 39, the guard will be automaticallyraised against the tension of the spring 36 and will ride along thetopsurface of the work while the saw is exposed. It will be understood,too, that since the saw disc is of smaller diameter than that of theshield, as clearly illustrated in the drawings, there will be a certainamount of movement of the screw 33 in the slot 34 before the saw discemerges from the shield. The relative movement between the saw disc andthe shield will, however, be limited by the length of the slot 34 andconsequently the depth to which the saw will be permitted to cut willalso'be determined by the length of the slot 34. As a means of furtherlimiting the extent to which the saw can be exposed, or, in other words,limiting the depth of groove which is to be cut, I have provided a bar40 which is slidably mounted upon the outer face of the wall35 of theshield by means of the headed screws 41 and slots 42. This strip .isprovided with stop portion 43 which is adapted to be set at diiferentpositions along the slot 34 so as to limit the movement of the screw 33in the slot 34, that is to a degree less than the full extent of theslot 34. A. scale is also provided upon the wall 35 of the shield bymeans of which the stop member 40 can be set according to the depth ofgroove desired, that is, whether a half inch, one inch, one and a halfinches or two inches.

The width of the-groove can also be varied by mounting one or more sawdiscs upon the hub of the bevel gear 24, these saw discs being clampedin the same manner as the single disc illustrated in the presentdrawing. The scale indicated on the wall 35 of the shield, as shown inFig. 1, corresponds to the middle or upright position of the sawillustrated in Fig. 5, and in setting the saw for various depths ofgrooves in the manner just referred to it will be necessary to take intoaccount the angular relation of the shield and the saw with respect tothe surface of the work.

I have provided also a means of setting the tool so as to cut at variousangles with respect to the end or side of the work. This means comprisesa stud or strip 44 which extends across the bottom of the guide orslide-way 1 and is adapted to abut the end or side of the work, asillustrated in Fig. 1 of the drawings. A pin 45 is secured in the stud44 and extends up through an opening in the web portion 1 of the slideor guideway. The squared portion 45 of the pin is adapted to receive thewasher 46 which is provided with an indicating finger portion 46 and hasits extreme upper end screw threaded for receiving the wing nut 47 forsecuring the parts-in position.

Thus, it' will be seen that upon loosening the nut 47 and holding thestud or strip 44 against the end or side of the work as illustrated inFig. l, the guide ortraekmember 1 can be turned to the proper anglewhich is read from the scale 48 corresponding to the angle of cutdesired. The nut 47 is then tightened. The tool can also be set at theproper angle desired with respect to the surface of the work byloosening the nut 16 and adjusting according to the scale 14. As beforeexplained, the slide member 40 can be set so as to limit the depth ofthe cut or, with the slide member 40 in the position in dicated in Fig.1, the saw will be permitted to cut to its full depth; in other words,until the screw pin 33 travels throughout the full length of the slot34. As the saw is applied to the work, the motor with the saw will beswung about the axis 10 into the position indicated in dotted lines inFig. 1, and will be maintained in such position during the cuttingoperation. Then, upon completion of the same and removal of the saw, theshield will automatically return so as to cover the saw.

I It is to be understood that this device can also be used for grinding,buffing and other such operations by simply substituting the proper formof disc in theplace of the saw.

Figs. 8 and lOshow how the same portable motor-operated saw as abovedescribed can be suspended from a table top 49 which in turn can becarried by the workman from place toplace and set upon any suitablesupports'50. In this case the screw eye 36 is removed and a screw plugis inserted in its opening as the guard is omitted. Depending from theunderside of the table top 49 is a hanger-51 which is secured thereto bymeans of bolts 52. This hanger is adapted to sup port the saw andunotorby having the handle portion .18 rest in the groove 51 in which positionthese parts are held together by means of the bracket arms 53 and 54 andthe hinged portions 53 and 54* so as to permit ready assembly anddisassembly of the parts. Part of the table top is-fixed to thecross-strips 49 but the other .part 49 is hinged at 49 to thecross-strips so that it can be swung open to permit the motor and saw tobe mounted in the hanger. The part 49 top.

is provided with a cut-out portion 55 to accommodate the gear housin 26and the saw projects up through the sot 56 which is provided between t etwo parts of the table The angle strip 5-7 which is secured to the tabletop in any suitable manner, serves as a guide for the work as it isadvanced along the table top during the sawing operation.

The parts are so arranged that the saw itself will project above thetable top sufficiently far for cutting and the Weight of motor issufficient to maintain the device in steady position'upon its support,the pressure of the work upon the table top cooperating also in thisregard.

Thus, with this arrangement, I have made it possible for the workmanhimself to carry the saw and table top to the place of the work insteadof having to carry the work to the saw as in the old form of device.Furthermore, this device can be readily supported wherever it isnecessary to use the same. A great deal of labor and time is therebysaved and the cost of operation correspondingly reduced.

Another factor contributing to the saving in expense resides in theability to use the same motor-operated tool in either of two styles ofoperation that is, the work can be fixed and the tool movable, or thework can be advanced to the tool while it occupies relatively fixedposition.

Having described my claim 1. A portable motor saw device, comprising areadily portable slideway adapted to invention, I-

be applied to the work and governing the plane of operation of the sawand having means to freely abut the work to maintain the slideway at thedesired angle across a face of the work, a carriage slidable on saidslideway, a motor on the carriage, and a saw rotated by said motor andmounted to be freely rockable below and back from the plane of theslideway, and handle means on the same rockable mounting by which eitherthe saw may be rocked or the carriage moved on the slideway.

2. In a device of the class described, the combination of a portablemotor, a cutting tool carried by and operated by said motor, a supportupon which said motor is rockably mounted about a horizontal axis, andmeans for rotatably mounting said support upon a horizontal axissubstantially normal to said first named axis, whereby said motor andtool are capable of adjustment for a' bevel cut and also towards andfrom the face of the work.

3. In a device of the class described, the combination of a portablemotor, a cutting tool carried by and operated by said motor, a supportupon which said motor is rockably mounted about a horizontal axis so asto permit the tool to be moved towards and from the work at all times,and means for rotatably mounting said support so as to set the tool atvarious angles about a horizontal axis substantially normal to saidfirst-named axis.

In testimony whereof I hereby affix my signature.-

JOHN M. CROWE. I

